JP3534876B2 - Combustion equipment - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a combustion device used in a hot water supply device or the like.

[0002]

2. Description of the Related Art Generally, a gas combustion device includes a heat exchanger,
It is composed of a burner portion provided at the lower end of the heat exchanger and an exhaust cover provided at the upper end of the heat exchanger. The heat exchanger comprises a copper plate having a rectangular cross-section with an axis directed in the up-down direction, a heat-absorbing tube penetrating from one side wall to the other side wall of the copper plate facing each other, and a fin provided on the heat-absorbing tube. When the burner section is ignited, the water supplied to the heat absorbing tube via the water supply tube is heated by the combustion gas via the fins and the heat absorbing tube. The heated water is supplied to the outside through the hot water outlet pipe.

[0003]

In the conventional gas combustion apparatus THE INVENTION An object will to solve the above-upper sidewall of the copper plate along the heat absorbing tube is disadvantageously subjected to thermal damage by the combustion gas. That is, when the ignition burner portion, the copper plate is heated by the combustion gas flowing therethrough. In this case, the outside of the copper plate bottom from the burner portion to the fins and the water supply pipe is wound, a copper plate bottom is cooled by the water supply pipe. Further, the side wall portion through which the heat absorbing tube penetrates is cooled by the heat absorbing tube. Therefore, those parts are less likely to be thermally damaged. However, the upper side wall of the copper plate along the heat absorbing tube, a water supply pipe not only not wound, not in contact with the heat absorbing tube, not cooled. For this reason,
The upper side wall of the copper plate along the heat absorption tube was thermally damaged.

[0004] Therefore, in the conventional gas combustion apparatus, along the inner surface of the copper plate flowing cooling air, prevents the combustion gases is in direct contact with the copper plate, this by the copper plate is subjected to thermal damage I was trying to prevent it. However, the combustion gas
To prevent contact to the copper plate by the cooling air, requires a large amount of air, it is necessary to space for the flow of the air. Therefore, the copper plate becomes large, and thus the whole combustion apparatus is another problem arises in size. In addition, when a large amount of cooling air is flowed, there is a problem that noise during combustion increases.

[0005]

In order to solve the above problems SUMMARY OF THE INVENTION The invention according to claim 1, through the copper plate forming a tubular shape, and the one side wall of its opposite in this copper plate to the other side wall A heat exchanger having an endothermic tube arranged in this way, a burner portion provided at the upstream end of the copper plate of this heat exchanger, and provided at the downstream end of the copper plate of the heat exchanger,
An exhaust cover communicating with the inside of the copper plate, the combustion gas by the burner portion passes through a gas passage formed by the inside of the copper plate and the exhaust cover, and is discharged from an exhaust port of the exhaust cover. In the configured combustion device, a projection portion projecting inward is formed on a portion along the heat absorption tube on the inner surface of the gas passage on the downstream side of the heat absorption tube and in the vicinity thereof , and the projection portion is the heat absorption tube of the copper plate. Along
It is an obstacle to reduce the amount of combustion gas flowing along the inner surface of the side wall.
In this case, the size of the opening of the end of the exhaust cover on the body plate side is adjusted so that the end of the exhaust cover on the body plate side protrudes from the inner surface of the copper plate for the reason described later. It is desirable to make the size smaller than the size of the opening on the downstream side of the copper plate and to make the portion of the exhaust cover protruding from the body plate the above-mentioned protruding portion.

[0006]

In the invention according to claim 1, the combustion gas tends to flow along the inner surface of the copper plate. However, in the vicinity below the downstream side from the heat absorbing tube of the gas passage inner surface is so disposed that protrusion portion along the heat absorbing tube, in the copper plate internal endothermic tube is placed, the combustion gas is endothermic It cannot flow along the inner surface along the tube, but away from it. Therefore, the wall of the copper plate along the heat absorbing tube is not heated to a high temperature by the combustion gas. When the lower end portion of the exhaust cover is formed as the protruding portion, it is not necessary to separately provide a special member as the protruding portion, and the manufacturing cost of the combustion device is reduced accordingly.

[0007]

Embodiments of the present invention will now be described with reference to FIGS.
Will be described with reference to. 1 to 4 show an embodiment of a combustion apparatus A according to the present invention. As shown in FIG. 2, the combustion apparatus A includes a heat exchanger 1 and a lower end portion of the heat exchanger 1. A gas burner portion (burner portion) 2 provided and an exhaust cover 3 provided at an upper end portion of the heat exchanger 1 are provided.

The heat exchanger 1 has a copper plate 1 as shown in FIG.
1 is provided. As shown in FIG. 1 and FIG. 3, the copper plate 11 has a tubular shape with a rectangular cross section with the axis lined up and down, and has front and rear side walls 11a, 11b, 11
c and 11d. At the lower end of the copper plate 11, a flange portion 11e protruding outward in the horizontal direction is provided on each side wall 11a.
It is formed along the lower end edge of 11d, and the flange portion 11f protruding outward in the horizontal direction is formed on the upper end portion of the copper plate 11 along the upper end edges of the side walls 11a to 11d. Bolt insertion holes 11g are formed in the left and right and rear portions of the flange portion 11f, respectively. Although not shown, a similar bolt insertion hole is also formed in the flange portion 11e.

At the upper part of the copper plate 11, a heat absorbing tube 12 is arranged. As is clear from FIGS. 1 and 2, the heat absorption tube 12 includes the left and right side walls 11c and 11d and the copper plate 1.
The inside of 1 is penetrated horizontally a plurality of times, and inside the copper plate 11, it extends parallel to the front and rear side walls 11a and 11b. The endothermic tube 12 includes the left and right side walls 11c, 11
One of d is fixed at a penetrating portion by brazing or the like, and the other is slidably supported inward and outward of the copper plate 11 by a silicon-based filler or caulking.

At one end (lower end) of the heat absorbing tube 12,
A water supply pipe 13 is connected, and water to be heated is supplied to the heat absorption pipe 12 via the water supply pipe 13. Water pipe 13
Has a lower part of the copper plate 11 spirally wound around it, whereby the lower part of the copper plate 11 is cooled and the supplied water is preheated. A hot water outlet pipe 14 is connected to the other end (upper end) of the heat absorbing pipe 12 for supplying water heated during passage through the heat absorbing pipe 12 to the outside.

As shown in FIG. 1, a large number of fins 15 made of a thin metal plate are provided inside the copper plate 11.
2 are arranged with a predetermined interval in the extending direction.
Each fin 15 is penetrated by the heat absorption tube 12.
Each fin 15 is in this embodiment secured by brazing or the like to the heat absorbing tube 12, the side wall 11a of the copper plate 11, and is movable with respect to 11b.

At the lower end of the copper plate 11, the casing 21 of the gas burner portion 2 has a flange portion 21a formed therein.
Are abutted against the flange portion 11e of the above and fixed by bolts (not shown) penetrating them. A gas burner (not shown) is provided inside the casing 21. A fan (not shown) for supplying combustion air to the gas burner is provided on the lower surface of the casing 21.
Is provided. And when you ignite the gas burner,
The combustion gas flows upward in the copper plate 11, and the combustion gas heats the water in the heat absorbing tube 12 through the fins 15 and the heat absorbing tube 12.

An exhaust cover 3 is fixed to the upper end of the copper plate 11. The exhaust cover 3 has a cover body 31 as shown in FIGS. 1 and 4. The cover main body 31 has a box-like shape with an open bottom and a front portion, and a plate portion 31a extending along both left and right side portions and a rear surface portion is formed at a lower end portion thereof. The plate portion 31a has a bolt insertion hole 1 of the flange portion 11f.
A bolt insertion hole 31b corresponding to 1 g is formed.

A connecting plate 32 is fixed over the lower surfaces of the front end portions of the left and right plate portions 31a. An exhaust port 33 is formed by the connecting plate 32 and the cover body 31. When the exhaust cover 3 is attached to the upper end portion of the copper plate 11, the inside of the copper plate 11 and the inside of the cover body 31 become a gas passage 34 for flowing combustion gas, and the combustion gas passing through this gas passage 34 is exhausted through the exhaust port 33. Is to be discharged from.

The rear side portion 32a of the connecting plate 32 is
As is apparent from FIG. 1, the central portion of the connecting plate 32 is bent in a stepwise manner so that it is positioned on the same plane as the plate portion 31a. The rear side portion 32a and the plate portion 31a form a square frame-shaped flange portion 3
5 (hatched portion in FIG. 4) is formed. The flange portion 35 is provided with the exhaust cover 3 facing the copper plate 11 in a predetermined direction.
It is fixed by the bolts that are abutted with f and are inserted into the bolt insertion holes 11g and 31b. The exhaust cover 3 is thereby fixed to the copper plate 11.

The quadrangle formed by the outer periphery of the flange portion 35 of the exhaust cover 3 has the same size as the quadrangle formed by the outer periphery of the flange portion 11f of the copper plate 11, but is formed by the inner periphery of the flange portion 35. The formed quadrangle is smaller than the quadrangle formed by the inner circumference of the flange portion 11f (the quadrangle shown by the imaginary line in FIG. 4). In other words, the lower end opening of the exhaust cover 3 is smaller than the upper end opening of the copper plate 11, and the inner circumference side portion of the flange portion 35 (the portion surrounded by the inner circumference of the flange portion 35 and the imaginary line) is correspondingly smaller. ) Protrudes inward from the inner circumference of the copper plate 11. The projecting portion serves as the projecting portion 36. In this case, the protruding portion 36 protrudes from the entire inner peripheral surface of the copper plate 11, but is protruded inward only from the front and rear side wall portions 11 a and 11 b extending in parallel with the heat absorbing tube 12 so that the right and left sides through which the heat absorbing tube 12 penetrates. Side wall portion 11c, 1
It may be located on the same plane without protruding with respect to 1d. In other words, the dimension of the lower end opening of the exhaust cover 3 is made equal to the dimension of the opening of the copper plate 11 in the left-right direction,
It may be smaller than the dimension of the opening of the copper plate 11 only in the front-back direction.

In FIG. 1, reference numeral 37 indicates the exhaust port 3
3 is a rain back for preventing rain from entering the heat exchanger 1, and reference numeral 38 is a sound absorbing material for absorbing the combustion noise of the gas burner.

In the combustion device having the above structure, the protruding portion 3
6 projects inward from the upper end opening of the copper plate 11, and this projection 36 is provided inside the copper plate 11 (gas passage 34
It becomes a kind of baffle against the combustion gas flowing inside. Therefore, in the upper part of the copper plate 11, the copper plate 11
A large amount of combustion gas will flow through the central part of the copper plate 1
The amount of combustion gas flowing along the inner surface of 1 is reduced. Therefore, it is possible to reduce or prevent the upper portion of the side wall of the copper plate 11, especially the upper portions of the front and rear side walls 11a and 11b extending in parallel with the heat absorption tube 12, from being thermally damaged by the combustion gas.

[0019] Moreover, it is not necessary to use the cooling air, it is possible to reduce the size of the copper plate 11, it is possible to turn size of the entire combustion apparatus A. Also, noise during combustion can be reduced.

Next, another embodiment of the present invention shown in FIGS. 5 and 6 will be described. In these embodiments, only parts different from the above embodiment will be described, and like parts to those in the above embodiment will be designated by like reference numerals and the description thereof will be omitted. Of course, these embodiments also have the same effects as the above embodiments.

In the combustion apparatus B shown in FIG. 5, the copper plate 1
One plate part of a projecting plate (projecting part) 4 having an L-shaped cross section is fixed to the inner surface of the upper opening of 1 by means such as brazing, and the other plate part is horizontally arranged from the inner surface of the copper plate 11. It is projected inward. In this case, the protruding plate 4
Is provided over the entire circumference of the upper end opening of the copper plate 11, but may be provided only on the front and rear side walls 11a and 11b, as in the above embodiment. In addition, in this embodiment, since the protruding plate 4 is provided, the lower end opening of the exhaust cover 3 has the same size as the upper end opening of the copper plate 11, and the inner circumference of the flange 35 is the flange 11f. It has the same dimensions as the inner circumference of.

In the combustion apparatus B of this embodiment, the projecting plate 4 acts similarly to the projecting portion 36 of the above-described embodiment. Therefore, the same effect as that of the above embodiment can be obtained. However,
In the case of this embodiment, it is necessary to newly provide the protruding plate 4. On the other hand, in the above embodiment, it is not necessary to provide a new member, and the manufacturing cost can be reduced accordingly.

Further, C combustion apparatus shown in FIG. 6 is one in which the only end of the front and rear of the lower end portion of the exhaust cover 3 is protruded from the upper end opening portion of the copper plate 11 inward. That is, the burner unit 2 includes the burner base 22 and the burner base 22.
And a burner case 21 in which The burner base 22 is a base body 2 having a rectangular parallelepiped shape that is long in the left and right
2a and has 1G electrodes 2 for ignition on both sides thereof.
2b and a flame lot electrode 22c for confirming combustion are provided respectively. On the other hand, the burner case 21 has a box shape with an open upper end, and the burner base 22 is inserted therein. Here, the burner case 2
The size of the burner case 21 in the front-back direction is the same as that of the base body 22a, but the length of the burner case 21 in the left-right direction is
It is longer than the base body 22a by b and 22c. As a result, the left and right sides are space portions (burner case 2 in FIG. 6) in which combustion gas hardly flows.
21b and 21c) between the inner surfaces on both sides of 1 and the imaginary line.

A copper plate 11 is fixed to the upper end of the burner case 21 with its flange portion 11e abutting against the flange portion 21a of the burner case 21.
The copper plate 11 has a substantially same sectional shape as the burner case 21. Therefore, the space portions 21b, 21
both sides of the copper plate 11 corresponding to c, i.e. left and right side walls 11c which is penetrated by the heat absorbing tube 12, never flows mostly combustion gas in a portion along each inner surface of 11d. Therefore, the left and right side walls 11c and 11d are not heated to a high temperature.

As described above, in the combustion apparatus C of this embodiment, the left and right side walls 11c, 11 through which the heat absorption tube 12 penetrates.
d is not heated to a high temperature, the front and rear side walls 11a,
Only 11b is heated. Therefore, the lateral dimension of the lower end opening of the exhaust cover 3 has become equal to the size of the top opening of the copper plate 11, no protrusion is formed therein. On the other hand, the front-rear dimension of the lower end opening of the exhaust cover 3, as in the above examples, have been made smaller than the size of the upper opening of the copper plate 11, whereby the front and rear lower end portion of the exhaust cover 3 , the protruding portion protruding from the upper end opening portion of the copper plate 11 on the inside (a portion shaded in FIG. 6) 36 is formed.

[0026]

As described above, according to the first aspect of the present invention, it is possible to prevent or reduce the thermal damage to the side wall of the copper plate along the heat absorption tube due to the combustion gas. Further, it is possible to obtain an effect that it is possible to prevent the entire combustion device from increasing in size and to reduce noise during combustion. In addition, claim 2
According to the invention of the above, in addition to the above-mentioned effects, an effect that the manufacturing cost of the combustion device can be reduced can be obtained.

[Brief description of drawings]

FIG. 1 is a sectional view showing a part of an embodiment of the present invention with a part thereof omitted.

FIG. 2 is a perspective view of the same embodiment.

FIG. 3 is a perspective view showing an upper portion of the plate.

FIG. 4 is a perspective view seen from below showing a part of an exhaust cover omitted.

FIG. 5 is a sectional view similar to FIG. 1, showing another embodiment of the present invention.

FIG. 6 is an exploded perspective view showing still another embodiment of the present invention.

[Explanation of symbols]

A gas combustion device (combustion device) B gas combustion device (combustion device) C gas combustion device (combustion device) 1 heat exchanger 2 Gas burner section (burner section) 3 exhaust cover 4 Projection plate (projection part) 11 copper plate 12 Endothermic tube 33 exhaust port 34 gas passage 36 Projection

Claims (3)

(57) [Claims] 1. A copper plate forming a tubular, and a heat exchanger having a heat absorbing tube from one side wall of its opposite in this copper plate disposed so as to penetrate to the other side wall, a copper plate of the heat exchanger A burner portion provided at an upstream end portion of the heat exchanger, and a downstream side end portion of the copper plate of the heat exchanger, and an exhaust cover communicating with the inside of the copper plate. In a combustion device configured to pass through a gas passage formed by a copper plate and the inside of the exhaust cover and to be discharged from an exhaust port of the exhaust cover, a gas passage inner surface in the vicinity of the downstream side of the endothermic pipe is ,
A projecting portion projecting inward is formed in a portion along the heat absorbing tube, and this projecting portion is an inner surface of a side wall of the copper plate along the heat absorbing tube.
Combustion device, which serves as a baffle for reducing the amount of combustion gas flowing along the combustion device. Wherein as copper plate side end portion of the exhaust cover projecting from the inner surface of the copper plate, the size of the opening of copper plate side end of the exhaust cover and smaller than the dimension of the downstream opening portion of the copper plate,
The portion projecting from the copper plate of the exhaust cover combustion apparatus according to claim 1, characterized in that the said projecting portion. 3. A heat exchanger having a tubular copper plate and a heat absorbing pipe arranged so as to penetrate from the one side wall to the other side wall facing the copper plate, and the copper plate of the heat exchanger. A burner portion provided at an upstream end portion and an exhaust cover provided at a downstream end portion of the copper plate of the heat exchanger and communicating with the inside of the copper plate are provided, and the combustion gas by the burner portion is the copper plate. And a combustion device configured to pass through a gas passage formed by the inside of the exhaust cover and to be discharged from an exhaust port of the exhaust cover, wherein the inner surface of the gas passage on the downstream side of the endothermic pipe has a:
Form a protruding portion that protrudes inward in a portion along the heat absorption tube, so that the end of the copper plate side of the exhaust cover protrudes from the inner surface of the copper plate, the size of the opening of the end of the copper plate side of the exhaust cover of the copper plate A combustion device, wherein the size is made smaller than the size of the downstream side opening, and the portion of the exhaust cover protruding from the copper plate is the above-mentioned protruding portion.